After many years of quiltmaking, I decided cornerstones were the only way to go. No matter how many times I measured and ripped there were always one or two intersections that looked a bit wonky. Cornerstones for me every time.

Here's a video on sashing alignment.
http://www.youtube.com/watch?v=1IwIjN3ehEU

that was great. I will try to do it that way. Thanks for the video hint.

Don't feel bad I am ripping my Medallion Star Burst apart to and making new pieces. Good luck. Just can't do those y seams.